I'm not able to confirm this, but judging from what i hear:
I believe Mark is singing in the second half of each verse and in the last chorus...
If anyone hear's him anywhere else, post it here
BTW, when i listened to this song at first i wasn't really sure how i felt, i was getting used to Myles voice.
I just listened again while reading the lyrics at the same time, and i must say i do really like this song.
I do agree when people say it does still sound creedish, but i will clarify by saying that it sounds that way instrumentally only, and for obvious reasons. It's not so much that it is "Creed's" sound, moreso it's Mark's sound. It's the style that Mark has created for himself that he enjoys, and i think people need to realize that it's not so much a creed sound as it is a Mark Tremonti sound.
All in all, i'm just happy that they're playing again, i was starting to miss them and was growing rather fond of all my cd's lol.
Can't wait until the album drops, i plan on picking it up asap. Hopefully there will be some heavier stuff on there, but if not i know i'm still going to enjoy it.